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What is PoE

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When the S7700 that supports Power over Ethernet (PoE) is configured with the external power supply (a PoE power supply frame) and installed with boards that support the PoE power supply, the S7700 can supply 48 V DC power to the attached downstream Powered Device (PD), for example, an IP phone, a WLAN AP, and a network camera, through twisted pairs. In this manner, the attached PD can be supplied with power remotely.

In the versions earlier than V100R005, all PoE power supplies are 250 W non-constant current power supplies. When two power supplies are used, they are used for power redundancy, but do not offer power.
In V100R005 and later versions, PoE power supplies include 250 W and 500 W constant current power supplies. When two 250 W or 500 W constant current power supplies are used, the power supplies can be used for power redundancy and offer power at the same time.
In V200R002 and later versions, PoE power supplies include 250 W, 500 W, 580 W, and 1150 W constant current power supplies. When two 580 W or 1150 W constant current power supplies are used, the power supplies can be used for power redundancy and offer power at the same time.